Very interesting. Note that at first glance there are three people, Kevin, Carolyn, and Michael. But the occasions where a name other than Kevin’s name is given are when a large group comes.
My WAG is the receptionist asks what is the name of your party? Cannard. And what is YOUR name? If alone, Kevin, if not, sometimes Carolyn, etc. The point being it looks like sometimes the brain doctor brings in 9 people.
Joe has an ENORMOUS brain.